
PIN OUT
Pin
1
2
3
4
5
6
7
8
Single Output
Inhibit
No connection
Output Common
Positive Output
No connection
Case Ground
Input Common
Positive Input
Dual Output
Inhibit
Positive Output
Output Common
Negative Output
No connection
Case Ground
Input Common
Positive Input
BOTTOM VIEW
MHF
Squared corner and dot on
top of cover indicate pin one.
1
2
3
4
5
8
7
6
B2-79
MHF SERIES
12 WATT
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
MHF2812D
TYP
MHF2815D
TYP
CONDITION
MIN
MAX
MIN
MAX
UNITS
OUTPUT VOLTAGE
+V
OUT
– V
OUT
11.88
12.0
12.12
14.85
15.0
15.15
VDC
11.82
12.0
12.18
14.77
15.0
15.23
OUTPUT CURRENT
1, 2
OUTPUT POWER
2
—
0.5
1.0
—
0.4
0.8
A
+V
OUT
– V
OUT
TOTAL
—
—
10.8
—
—
10.8
—
—
10.8
—
—
10.8
W
—
—
12
—
—
12
OUTPUT RIPPLE
VOLTAGE
10 kHz TO 2 MHz
—
30
60
—
30
60
mV p-p
LINE REGULATION
MIN. TO MAX. V
IN
LOAD REGULATION
+V
OUT
—
5
50
—
5
50
mV
NO LOAD TO FULL
+V
OUT
—
5
50
—
10
50
mV
CROSS REGULATION
20% TO 80% LOAD
3
50% LOAD
4
—
5
10
—
4
8
%
—
4
5
—
3
5
INPUT VOLTAGE
CONTINUOUS
16
28
40
19
28
40
VDC
NO LOAD TO FULL
TRANSIENT 50 ms
—
—
50
—
—
50
V
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
—
—
—
25
—
1.9
35
550
3
—
—
—
25
—
1.9
35
536
3
mA
INPUT RIPPLE
CURRENT
10 kHz TO 2 MHz
—
175
240
—
175
240
mA p-p
EFFICIENCY
LOAD FAULT
5
78
81
—
80
83
—
%
POWER DISSIPATION
SHORT CIRCUIT
—
—
2.8
—
—
2
W
OVERLOAD
—
—
5
—
—
5
START-UP
DELAY
—
150
250
—
150
250
ms
Notes
1. Applies to both outputs.
2. Maximum combined output power is 12 watts. A maximum of 90% is avail-
able from either output.
3. 20% to 80% load on the positive output and 80% to 20% on the negative
output. See Figure 8.
4. 50% load on the positive output and 50% to 20% load on the negative output.
50% load on the negative output and 50% to 20% load on the positive output.
See Figure 7.
5. Indefinite short circuit protection not guaranteed above 125°C case temper-
ature.
MODEL NUMBER KEY
MHF 28 12 D / ES
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
F
IGURE
1: P
IN
O
UT
See Section B8, case E1, for dimensions.